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[Impala-ASF-CR] IMPALA-4029: [DOCS] Include known issue for 'flat buffers' change

Date

Tue, 20 Jun 2017 21:42:22 GMT

Dimitris Tsirogiannis has posted comments on this change.
Change subject: IMPALA-4029: [DOCS] Include known issue for 'flat buffers' change
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Patch Set 1:
(3 comments)
http://gerrit.cloudera.org:8080/#/c/7236/1/docs/topics/impala_known_issues.xml
File docs/topics/impala_known_issues.xml:
PS1, Line 572: in memory usage for Impala catalog metadata (table files
: and data blocks). By default, the memory overhead is about 5-7%.
If the
: <codeph>compact_catalog_topic</codeph> flag is used,
the memory usage is
: more substantial, approximately twice as much as in previous versions.
Increase in memory usage is not the correct description. The effect is increase in catalog
update topic size (you have the correct numbers) which results in higher CPU and network utilization
when the statestore broadcasts catalog update topics to the impalads.
PS1, Line 578: High
I'd say Medium.
PS1, Line 583: A fix is in the pipeline
IMPALA-5500 is the jira for this fix.
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Gerrit-MessageType: comment
Gerrit-Change-Id: I65495748984268763b2690c193488a338409e13e
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: John Russell <jrussell@cloudera.com>
Gerrit-Reviewer: Dimitris Tsirogiannis <dtsirogiannis@cloudera.com>
Gerrit-Reviewer: Greg Rahn <grahn@cloudera.com>
Gerrit-Reviewer: John Russell <jrussell@cloudera.com>
Gerrit-HasComments: Yes